> Note that calculating the length of a slice is a fast operation; it's
> a single memory load.
So, actually it just loads a slice header's field?
On Thu, 09/06/18, fff Sep 06, 2018 at 12:56:36PM -0700, Ian Lance Taylor wrote:
> On Thu, Sep 6, 2018 at 12:24 PM, mustafa katipoğlu
> <98mustafakatipo...@gmail.com> wrote:
> >
> > If I use len() function inside of a foor loop , does it calculates the
> > output each time? or if the output will be the same(like arrays) will it
> > calculates the length of the function again ?
> >
> > var letterRunes =
> > []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_")
> >
> >
> > b := make([]rune, usernameLength)
> >
> >
> > for i := range b {
> > b[i] = letterRunes[rand.Intn(len(letterRunes))]
> > }
>
> It will recalculate the length each time through the loop.
>
> Note that calculating the length of a slice is a fast operation; it's
> a single memory load.
>
> Ian
>
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